640266006342 has 32 divisors (see below), whose sum is σ = 1313390287872. Its totient is φ = 207984601664.

The previous prime is 640266006329. The next prime is 640266006349. The reversal of 640266006342 is 243600662046.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 640266006342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640266006349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4806498 + ... + 4937909.

It is an arithmetic number, because the mean of its divisors is an integer number (41043446496).

Almost surely, 2^640266006342 is an apocalyptic number.

640266006342 is an abundant number, since it is smaller than the sum of its proper divisors (673124281530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640266006342 is a wasteful number, since it uses less digits than its factorization.

640266006342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9744692.

The product of its (nonzero) digits is 248832, while the sum is 39.

Adding to 640266006342 its reverse (243600662046), we get a palindrome (883866668388).

The spelling of 640266006342 in words is "six hundred forty billion, two hundred sixty-six million, six thousand, three hundred forty-two".